Ella dives three times into a lake. Her elevations relative to the water's
surface are -6.9 feet, -8 feet, and -7.5 feet. She
dives three more times with each dive 0.75 feet deeper
than each of the first three. Write and evaluate
expressions to determine the elevations, in decimal
form, of her fourth, fifth, and sixth dives.

step-by-step explanation:

how many centimeters did the level of the salsa go down by?

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

it would be 6xy and -16xy.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!